When any lot, building, or structure within the City, because of accumulation of refuse or debris, the uncontrolled growing of noxious weeds, or age, or dilapidation, or because of any other condition or happening, becomes, in the opinion of the City Council, a public hazard or nuisance which is dangerous to the health, safety, or welfare of the inhabitants of the City or of those residing or habitually going near such lot, building, or structure, the City Council may, after investigation, give notice by publication and/or by registered mail addressed to the last known address of the owner or owners of the land upon which such nuisance exists, or to owner of the building or structure itself, specifying the nature of the nuisance and requiring such owner to alter, repair, tear down, abate, or remove the nuisance promptly and within a time to be specified by the City Council, which shall be commensurate with the nature of the nuisance. If, at the expiration of the time limit in said notice, the owner has not complied with the requirements thereof, or in any case where the owner of the land or of the building or structure itself is not known the City Council may order such hazard or nuisance abated by the proper department or agency of the City which is qualified to do the work required, or may do the work by contract or by hire and the cost of such abatement assessed against the lot, premises, or description of real property upon which such hazard or nuisance is located, by special assessment.